A 24-year-old Indian-origin man in Singapore has been sentenced to ten weeks in jail for his penchant for violence, having no control over his rage and hurting his pregnant girlfriend.

Mohamed Mustaffa Ali was sentenced on Wednesday by the Singapore District Court Judge Mathew Joseph after he pleaded guilty to two counts of assault - one was a road rage case last year and the other for hurting his pregnant girlfriend in 2017.

The judge also ticked off Mustaffa for his penchant for violence and having no control over his rage, reported The New Paper on Thursday.

The judge sentenced Mustaffa to 10 weeks' jail, the report said.

In the early hours of June 11 2017, Mustaffa had quarrelled with his girlfriend Shahiqah Nadiyeh Mohammad Herman, then 21, over her former boyfriend.

The agitated Mustaffa slapped her face three times and kicked her thigh twice, despite knowing she was four months pregnant, the report added.

Deputy Public Prosecutor Ng Jun Chong told the court that Mustaffa had also pulled her off a mattress she was sitting on in a cousin's house.

"The accused then dragged the victim out of the room and into the corridor... by her legs," Mr Chong said.

His cousin then called the police. When the police arrived, Ms Shahiqah refused to have a medical examination but told them she had bruises from Mustaffa's assault.

She later gave birth to a healthy boy and married Mustaffa last December.

In another incident, in March last year, Mustaffa was driving a rented car on the extreme right lane of an expressway at about 9pm when he flashed the high beam at a car travelling in front of him at 60 to 70km/h.

The car moved to the middle lane, but when the vehicles were side by side, both drivers wound down their windows to exchange vulgarities and rude gestures.

They then stopped their cars at the road shoulder and got out to confront each other.

When Mustaffa raised his hands, the other man, Lum Wai Keong, 49, punched him in the face.

Mustaffa returned to his car to grab a wooden stick about the length of two arms and hit Mr Lum with it repeatedly until it broke.

Mr Lum, who suffered abrasions on his knee and forearms, has been charged in court with assaulting Mustaffa. His case is pending.

Mustaffa told the court that he had hit Ms Shahiqah after losing control of himself because of stress from his recent divorce.